73.66.127.87
98.50.154.190
110.249.212.46
212.38.166.29
95.166.12.155
93.84.97.33
92.239.3.149
91.146.64.130
80.8.229.28
2.121.123.243

2017/1/4 20:58:03 Notice [Dhcpc][1466]: erouter0 T1 Expired, Enter Renew State
2017/1/3 00:27:10 Notice [Dhcpc][1466]: erouter0 got new IP 73.66.127.87
2017/1/3 00:27:04 Notice [Dhcpc][1319]: mta0...

Strip IP's from a router log file I have named loluser:
grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' loluser > stripIP

count uniq IP's from loluser text file:
awk...